1988180 has 12 divisors (see below), whose sum is σ = 4175220. Its totient is φ = 795264.

The previous prime is 1988177. The next prime is 1988183. The reversal of 1988180 is 818891.

It is an interprime number because it is at equal distance from previous prime (1988177) and next prime (1988183).

It can be written as a sum of positive squares in 2 ways, for example, as 1012036 + 976144 = 1006^2 + 988^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1988180.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49685 + ... + 49724.

It is an arithmetic number, because the mean of its divisors is an integer number (347935).

2^1988180 is an apocalyptic number.

1988180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988180 is an abundant number, since it is smaller than the sum of its proper divisors (2187040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1988180 is a wasteful number, since it uses less digits than its factorization.

1988180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99418 (or 99416 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 1988180 is about 1410.0283685089. The cubic root of 1988180 is about 125.7434099681.

The spelling of 1988180 in words is "one million, nine hundred eighty-eight thousand, one hundred eighty".